Simple select to get data based on a date

Question

Hi all
I have written some data to a table and am having issues trying to do a select and get that data based on the query.
I want to filter on a column called: TIMESTAMP based on the condition that the data was written to the DB on the following date:
01-OCT-09 10.47.35.597914000
I thought this would be enough:
select * from tableX
where current_value = 999
and TIMESTAMP = '01-Oct-2009'
I know the 999 exists because if I take out the last line I get the data I want.
A basic question I know but any help much appreciated.

Answer 1

Dird wrote:
Hi Boneist,
When using > or < I use TO_DATE with DD-MON-YYYY or whatever format I need. TO_CHAR just comes to mind naturally when I need an equality test.
MikeHmm....
Let's see ->
satyaki>
satyaki>select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
PL/SQL Release 11.1.0.6.0 - Production
CORE    11.1.0.6.0      Production
TNS for 32-bit Windows: Version 11.1.0.6.0 - Production
NLSRTL Version 11.1.0.6.0 - Production
Elapsed: 00:00:00.02
satyaki>
satyaki>
satyaki>select * from emp;
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
      7566 JONES      MANAGER         7839 02-APR-81       2975                    20
      7654 MARTIN     SALESMAN        7698 28-SEP-81       1250       1400         30
      7698 BLAKE      MANAGER         7839 01-MAY-81       2850                    30
      7782 CLARK      MANAGER         7839 09-JUN-81       2450                    10
      7788 SCOTT      ANALYST         7566 19-APR-87       3000                    20
      7839 KING       PRESIDENT            17-NOV-81       5000                    10
      7844 TURNER     SALESMAN        7698 08-SEP-81       1500          0         30
      7876 ADAMS      CLERK           7788 23-MAY-87       1100                    20
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7900 JAMES      CLERK           7698 03-DEC-81        950                    30
      7902 FORD       ANALYST         7566 03-DEC-81       3000                    20
      7934 MILLER     CLERK           7782 23-JAN-82       1300                    10
14 rows selected.
Elapsed: 00:00:00.07
satyaki>
satyaki>
satyaki>select *
  2     from emp
  3     where hiredate < to_date('01-MAR-1981','DD-MON-YYYY');
     EMPNO ENAME      JOB              MGR HIREDATE         SAL       COMM     DEPTNO
      7369 SMITH      CLERK           7902 17-DEC-80        800                    20
      7499 ALLEN      SALESMAN        7698 20-FEB-81       1600        300         30
      7521 WARD       SALESMAN        7698 22-FEB-81       1250        500         30
Elapsed: 00:00:00.00
satyaki>
satyaki>select *
  2     from emp
  3     where to_char(hiredate,'DD-MON-YYYY') < {noformat}'{noformat}01-MAR-1981{noformat}'{noformat} ;
no rows selected
Elapsed: 00:00:00.00
satyaki>
satyaki>So, as you can clearly see considering date as string may cost you heavy. Or don't you think so?
Regards.
Satyaki De.
N.B.: Some problem with the formatting. So, date is not appearing in the second case. :(